This is a stainless steel extension spring. It has a diameter of 2mm, a total length of 15mm, and a wire thickness of 0.3mm. These were stocked for repairing camera lenses and printers, and are new and unused. Surprisingly, extension springs of this small size are hard to find, so how about stocking up? If you would like to purchase 10 or more, please leave a comment and I will prepare them. ・For hanging the standard encoder of Canon printers Thank you for your consideration.